Like dancers, yoga practitioners move constantly from one pose to the next, surreptitiously casting third eyes in the direction of studio mirrors to check for proper form. Go with the flow with today's Groupon: for $30, you get one month of unlimited Vinyasa yoga classes at Sonic Yoga (a $119 value).

Inside a serene, sunlit studio, Sonic Yoga's group of studied yoga instructors leads students of all skill levels through dynamic Vinyasa flow classes. The seven-day schedule gives students ample opportunity for centering with morning and evening stretch sessions. New students can acquaint themselves with basics during Flow Fundamentals sessions, where teachers help budding cobras link empowering poses together with deep-breathing techniques and balance-challenging transitional movements. Advanced-class instructors lead their charges in working up a sweat with challenging binds, twists, and inverted poses usually reserved for dozens of car-stuffing clowns. Hatha-style yoga classes welcome practitioners of all abilities, melting muscles into deep, relaxing stretches while centering the mind with longer held positions and emphasized breath.